Electrical circuit breaking and making device for telegraphic purposes.



U. E. DAVIES.

ELEGTRIGAL GIRGUIT BREAKING AND MAKING DEVICE FOR TELEGRAPHIO PURPOSES;

APPLICATION FILED NOV. 27, 1907.

Patented Mar. 30, 1909.

FIG. I.

INVENI'OR WI TNHSSBS 0%; 7M 1% O-E-DAVIES ArrY.

YHE NORRIS PEJERS co, WASHINGTON, c.

UNITED srn rns CHARLES EDWARD DAVIES, OTTAWA, ONTARIO, CANADA.

ELECTRICAL CIRCUIT BREAKING AND MAKING DEVICE FDR TELEGRAPHIC PURPOSES.

Specification of Letters Patent.

Application filed November 27, 1907.

Patented March 30, 1909.

Serial No. 404,146.

To all whom it may concern:

Be it known that I, CHAR-LES EDWARD DA- vrns, of Ottawa, in the countyof Carleton, Province of Ontario, Canada, have invented certain new anduseful Improvements in Electrical Circuit Breaking and Making Devicesfor Telegraphic Purposes, of which the following is a specification.

My invention relates to improvements in electrical circuit breaking andmaking devices for telegraphic purposes, and the general object of theinvention is to provide a device of this class having exceedingly simpleand eflicient means for simultaneously reaking one circuit and makinganother circuit.

In particular, the objects are to combinea pair of the devices with anarrangement of circuits to form a repeater, in which the number ofinstruments employed may be reduced and which will operate effectuallyunder all conditions.

The details of the invention are described more fully in the followingspecifications and accompanying drawings, and specifically set forth inthe claims.

In the drawings, Figure 1 is a diagrammatic view illustrating theconnection of two of the instruments as a repeater. Fig. 2 is a sideview of the actual construction of the instrument itself.

Referring, first to Fig. 2 A represents a suitable base having a magnetB supported thereon by brackets a and b, and provided with two sets ofwindings connected respectively to the pairs of binding posts 0, c, d,and d, and through the center of the magnet a core C extends adjustableby means of a screw e. In front of the magnet an armature D of suitablemagnetic material is provided, and pivoted at f adjacent to the base.This magnet is normally retained in its position farthest removed fromthe magnet by means of a tension sprin 9 connected to a suitable bracketh on the see. Above, and slightly in front of the magnet, a bracket E isprovided having a top member i of insulating material, which supports aflexible spring lever F which carries at its extremity a contact point Gwhich is suitably insulated from the remainder of the lever and hasconnected thereto a line wire 7' which leads to a binding post I. Thecontact point G is adapted to be engaged by the end of the armature Dwhen drawn toward the magnet. The upper part of the lever F carries asecond contact point l which is adapted to coact with a similar pointcarried on the end of a screw H supoorted by an insulating bushing m inthe racket E and having a binding set-screw n at the extremity thereof.In addition to the tension of the spring metal in the lever F a smallspring 0 is connected to the upper part thereof, and to a screw 1)extending through an insulating bushing in the frame, whereby thetension may be accurately adjusted.

In the bottom of the frame E a screw I may be supported in an insulatedbushing q, the end of which is adapted to form a back stop for thearmature D and on the opposite side a screw J may be provided, adaptedto contact with the reverse side of the spring lever F at once affordinga front stop for the same and means for making and breaking anauxiliary-circuit should it be so desired.

It will be observed in connection with the mechanical structure of theinstrument itself that the combination of the spring operating thearmature D, the spring lever F, and tension spring 0 connected. to thesame, afford together an exceedingly accurate means of adjusting andregulating the movements of the lever and armature.

Referrin now to Fig. 1, which diagrammatically s ows the connection oftwo of the instruments to form a repeater, K and L represent the eastand west main lines respectively having keys 5, 5 and batteries 6, 6therein. Each of these lines are connected to the windings 7, 7 on theelectro-magnets 8, 8 forming part of the two instruments. Each main linecircuit after passing through one winding of the magnet of oneinstrument is then led to the opposite instrument and connected to thearntiature 9 or 9, thereof, and from thence through the contact point 10or 10 to the battery 6 or 6 to the ground. The second windings 11, 11 onthe magnets 8, 8 are connected to local circuits 1.2, 12 which includethe batteries 13, 13 and are completed through contact )oints 14, 14 andthe spring levers 15, 15, the electromagnet- 11 or 11 and the lever 15or 15 in each local circuit, being thus on opposite instruments; that isto say, tracing out the local circuit, it will first pass through themagnet of one in strument, then pass to the spring armature of the otherinstrument, back through the contact point cooperating therewith,through its own battery and from thence to the electromagnet again.

In operation, when the line is at rest both the armatures 9, 9 willbekept closed by the current in the main lines operating through thewindings 7", 7 of the electro-magnets. When however, one line is 0 )ento give a sig nal, which is the condition illustrated in Fig. l, wherethe west. line is open, the armature 9 will be released breaking theeast line, but, at the same time as this is done, the local circuit 12is completed, preventing the magnet from becoming demagnetized andcontinuing to hold the armature 9 in position, thus maintaining thecontinuity of the main line L through the armature 9 and contact point10, From this it will be seen that whenever one of the main lines arebroken to give a signal the corresponding local circuit is automaticallycompleted and operates to prevent the breaking of the main. line givingthe signal through the deonergizing oi the magnet, which would otherwiseresult from the breaking of the opposing main line.

The manner of transmitting the signal from one line to the opposing lineis particularly to be noted. It will be observed that whenever a breakis made in one line, for in-- stance L, the deenergizing oi the magnet Swill result in a break between the armature 9 and contact point 10',Which willbreak the main line K. When the line L is again completed, themagnet 8 will be energized again completing the circuit L, the make andbreak in theopposing line being at all times ellected by an armatureoperated directly by the current in the line transmitting the signal.

It will be observed that the number of instruments in the repeater hasbeen very much reduced, the one set o'l levers serving for both the mainand the local circuits owing to the fact that the magnets S and 8 carrytwo windings. As explained hereinb efore, the adjustment of theinstrument can be made very fine.

'l ihile the invention has been described herein with greatparticularity of detail, yet it Will be readily understood that incarrying out the construction of the same, changes may be made, withinthe scope of the ap pended claims Without departing fl'ODl the spirit ofthe invention.

hat I claim as my invention is 1. In a telegraph instrument, and incombination, an electro-magnet, a pivoted armature disposed in front ofthe same, spring means for retaining the armature in retracted position,a separately movable circuit controlling member adapted to be engaged bythe armature during movement and to be .moved thereby, andmeanscooperative With i being disengaged from the armature.

2. In a telegraph instrument, and in com bination, an electrohnagnet, apivoted armature disposed in front of the same, spring means forretaining the armature in retracted position, a separately movable,circuit controlling member formed of spring metal, adapted to be engagedby the armature during movement and to be moved thereby, and meanscooperative with the circuit closing member for completing a circuitthrough the armature, during energization of the magnet, and breakinganother circuit when moved by the armature, the normal position of thesaid armature being disengaged from the armature.

3. In a telegraph instrument, the combination with the tiltablearmature, a magnet operating the same, of a spring lever V raving theend thereof adapted to be engaged by the armature in its movement towardthe magnet, a frame supporting the spring lever, a screw carriedthereby, and insulated therefrom and adapted to normally engage theupper part of the lever, which lever is adapt ed to be moved out ofcontact with the screw by the operation of the armature, and anadjustable back stop for the armature.

4:. In a telegraph instrument, the combination with the tiltablearmature, a magnet operating the same, of a spring lever having aninsulated contact point at the end thereof, adapted to be engaged by thearmature in its movement toward the magnet, sup porting means for thespring lever, an insulated screw normally engaging the upper part of thespring lever, which lever is adapted to be moved out of engagementtherewith by the movement of the armature, and an adjustable screwhaving the end thereof adjacent to the back of the spring lever andadapted to contact with the same when the lever is moved by thearmature.

In witness whereof I have hereunto set my hand in the presence of twowitnesses.

CHARLES ED'YVARD DAVIES. l fitnesses R. S. SMART,

J. H. GLEN.

